$(document).ready(function(){
	$("#user_id").focus(function(){
		$("#user_id").css("background", "url('image/bg_top_blank_text.png')");
	});
	$("#user_id").blur(function(){
		if ($("#user_id").val() == "") {
			$("#user_id").css("background", "url('image/bg_top_username_text.png')");
		}
	});
	
	$("#password").focus(function(){
		$("#password").css("background", "url('image/bg_top_blank_text.png')");
	});
	$("#password").blur(function(){
		if ($("#password").val() == "") {
			$("#password").css("background", "url('image/bg_top_password_text.png')");
		}
	});
});